If one dissector is registered for multiple protocols is it possible to distinguish between them at dissection time. basically
do an of the args to the dissector callback contain information about which protocol is being dissected ???
The right way to do that is not to register on dissector for multiple
protocols; if they're mostly the same, have a routine that does the
dissection and that takes a "what protocol is this?" argument, and have
separate dissectors for each of the protocols that calls the common
routine with the appropriate value for the "what protocol is this?"